1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/audit.h>
6 #include <linux/errno.h>
7 #include <linux/kernel.h>
9 #include <linux/ptrace.h>
10 #include <linux/regset.h>
11 #include <linux/sched.h>
12 #include <linux/sched/task_stack.h>
13 #include <linux/signal.h>
14 #include <linux/smp.h>
15 #include <linux/tracehook.h>
16 #include <linux/uaccess.h>
17 #include <linux/user.h>
19 #include <asm/thread_info.h>
21 #include <asm/pgtable.h>
22 #include <asm/processor.h>
23 #include <asm/asm-offsets.h>
25 #include <abi/regdef.h>
27 #define CREATE_TRACE_POINTS
28 #include <trace/events/syscalls.h>
30 /* sets the trace bits. */
31 #define TRACE_MODE_SI (1 << 14)
32 #define TRACE_MODE_RUN 0
33 #define TRACE_MODE_MASK ~(0x3 << 14)
36 * Make sure the single step bit is not set.
38 static void singlestep_disable(struct task_struct *tsk)
42 regs = task_pt_regs(tsk);
43 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
46 static void singlestep_enable(struct task_struct *tsk)
50 regs = task_pt_regs(tsk);
51 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
55 * Make sure the single step bit is set.
57 void user_enable_single_step(struct task_struct *child)
59 singlestep_enable(child);
62 void user_disable_single_step(struct task_struct *child)
64 singlestep_disable(child);
72 static int gpr_get(struct task_struct *target,
73 const struct user_regset *regset,
74 unsigned int pos, unsigned int count,
75 void *kbuf, void __user *ubuf)
79 regs = task_pt_regs(target);
81 /* Abiv1 regs->tls is fake and we need sync here. */
82 regs->tls = task_thread_info(target)->tp_value;
84 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
87 static int gpr_set(struct task_struct *target,
88 const struct user_regset *regset,
89 unsigned int pos, unsigned int count,
90 const void *kbuf, const void __user *ubuf)
95 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
99 /* BIT(0) of regs.sr is Condition Code/Carry bit */
100 regs.sr = (regs.sr & BIT(0)) | (task_pt_regs(target)->sr & ~BIT(0));
101 #ifdef CONFIG_CPU_HAS_HILO
102 regs.dcsr = task_pt_regs(target)->dcsr;
104 task_thread_info(target)->tp_value = regs.tls;
106 *task_pt_regs(target) = regs;
111 static int fpr_get(struct task_struct *target,
112 const struct user_regset *regset,
113 unsigned int pos, unsigned int count,
114 void *kbuf, void __user *ubuf)
116 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
118 #if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
120 struct user_fp tmp = *regs;
122 for (i = 0; i < 16; i++) {
123 tmp.vr[i*4] = regs->vr[i*2];
124 tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
127 for (i = 0; i < 32; i++)
128 tmp.vr[64 + i] = regs->vr[32 + i];
130 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
132 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
136 static int fpr_set(struct task_struct *target,
137 const struct user_regset *regset,
138 unsigned int pos, unsigned int count,
139 const void *kbuf, const void __user *ubuf)
142 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
144 #if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
148 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
152 for (i = 0; i < 16; i++) {
153 regs->vr[i*2] = tmp.vr[i*4];
154 regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
157 for (i = 0; i < 32; i++)
158 regs->vr[32 + i] = tmp.vr[64 + i];
160 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
166 static const struct user_regset csky_regsets[] = {
168 .core_note_type = NT_PRSTATUS,
169 .n = sizeof(struct pt_regs) / sizeof(u32),
171 .align = sizeof(u32),
176 .core_note_type = NT_PRFPREG,
177 .n = sizeof(struct user_fp) / sizeof(u32),
179 .align = sizeof(u32),
185 static const struct user_regset_view user_csky_view = {
187 .e_machine = ELF_ARCH,
188 .regsets = csky_regsets,
189 .n = ARRAY_SIZE(csky_regsets),
192 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
194 return &user_csky_view;
197 void ptrace_disable(struct task_struct *child)
199 singlestep_disable(child);
202 long arch_ptrace(struct task_struct *child, long request,
203 unsigned long addr, unsigned long data)
209 ret = ptrace_request(child, request, addr, data);
216 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
218 if (test_thread_flag(TIF_SYSCALL_TRACE))
219 if (tracehook_report_syscall_entry(regs))
220 syscall_set_nr(current, regs, -1);
222 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
223 trace_sys_enter(regs, syscall_get_nr(current, regs));
225 audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
228 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
230 audit_syscall_exit(regs);
232 if (test_thread_flag(TIF_SYSCALL_TRACE))
233 tracehook_report_syscall_exit(regs, 0);
235 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
236 trace_sys_exit(regs, syscall_get_return_value(current, regs));
239 extern void show_stack(struct task_struct *task, unsigned long *stack);
240 void show_regs(struct pt_regs *fp)
246 pr_info("\nCURRENT PROCESS:\n\n");
247 pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
250 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
251 (int) current->mm->start_code,
252 (int) current->mm->end_code,
253 (int) current->mm->start_data,
254 (int) current->mm->end_data,
255 (int) current->mm->end_data,
256 (int) current->mm->brk);
257 pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
258 (int) current->mm->start_stack,
259 (int) (((unsigned long) current) + 2 * PAGE_SIZE));
262 pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
263 pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
264 pr_info("SP: 0x%08lx\n", (long)fp);
265 pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
266 pr_info("PSR: 0x%08lx\n", (long)fp->sr);
268 pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
269 fp->a0, fp->a1, fp->a2, fp->a3);
270 #if defined(__CSKYABIV2__)
271 pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
272 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
273 pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
274 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
275 pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
276 fp->regs[8], fp->regs[9], fp->lr);
277 pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
278 fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
279 pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
280 fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
281 pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
282 fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
283 pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
284 fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
285 pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
288 pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
289 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
290 pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
291 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
292 pr_info("r14: 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
293 fp->regs[8], fp->regs[9], fp->lr);
297 tp = ((unsigned char *) fp->pc) - 0x20;
298 tp += ((int)tp % 4) ? 2 : 0;
299 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
301 pr_cont("\n%08x: ", (int) (tp + i));
302 pr_cont("%08x ", (int) *sp++);
306 pr_info("\nKERNEL STACK:");
307 tp = ((unsigned char *) fp) - 0x40;
308 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
310 pr_cont("\n%08x: ", (int) (tp + i));
311 pr_cont("%08x ", (int) *sp++);
315 show_stack(NULL, (unsigned long *)fp->regs[4]);